Imaging with focal > 80 inchs

Yves Laroche

Hi everyone!

Does anybody has done imaging with focal lenght of 80 inchs and over without
guiding with an 1200GTO or 900GTO? Please let me know exposure time, focal
lenght and ccd model.

I need this information to choose between an ST-7E or ST-9E for astronometric
works with C-8 and C-11 optical tube @ f/10. Normally people choose ST-7E
because focal lenght of 36 inchs is required (2"/pixel) and it needs, by the
way, less precision of the mount. Does 1200GTO will be well suite for
astronometrical works with long focal lenght?

Thank you,

Yves Laroche

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